Chapter Twenty One: Diagnostic Mode

The notification arrived while Julian was halfway through a piece of artisanal sourdough topped with avocado and microgreens, the flavors bright and briefly perfect on his tongue. His hand stopped in midair. A few delicate herbs drifted onto the composite tabletop.

The notice pulsed in his vision, steady and impatient.

INSTITUTE NOTICE:
THANKSGIVING RECESS APPROVED.
CATALYST WILL OPERATE IN DIAGNOSTIC-ONLY MODE WHILE OFF-CAMPUS.
NO COGNITIVE, EMOTIONAL, OR PHYSIOLOGICAL INTERVENTION PERMITTED.

Julian read it twice.

Diagnostic-only.

The words had the clean, clinical quality of a medical instruction: precise, impersonal, designed to forestall argument. Somewhere around him, a chair scraped back. Someone laughed. The ordinary sounds of breakfast continued while he held his toast above the plate.

He had wanted to go home.

He still did.

His stomach knotted anyway, as if something essential had been silently confiscated.

He stepped out of the car and East Los Angeles came at him all at once.

Santa Ana winds funneled between the narrow buildings. The air layered itself without apology: grease spattering from the taco truck on the corner, the sweet steam of masa cooking somewhere behind it, exhaust, fine dust catching the light. Underneath it all lay the faint mineral tang of smog he had spent his whole childhood learning to ignore and never quite managed to.

Nothing assigned any of it a value. Nothing tagged it. It arrived as the world used to arrive: all at once, unsorted, his to sort.

Reggaetón pulsed from a speaker two cars down. It bled at the edges into a corrido from somewhere farther off, the two rhythms warping together over hot asphalt and car hoods. A siren opened up in the distance, far enough to be someone else’s problem, close enough to pay attention to.

Julian stood at the curb with his bag pulling against his fingers.

Catalyst was present but still, as a person is still when asked not to speak. The familiar quiet had not entirely gone. But the pressure behind his eyes did not come forward. Nothing gathered the noise and made room inside it.

Everything from here to Sunday was his to carry at the old weight.

Under the lean trunk of the palm tree on the corner, his abuela’s folding table was already set up. She stood at it as if the corner had been deeded to her. A smooth ball of masa rested in her palm, her fingers dusted white, and the scent of fresh tortillas came off the griddle behind her in warm, grounding waves.

“Mijo.” Her grin was immediate and total. “You got skinny.”

Julian laughed and leaned into the embrace, which was, as always, firmer than it looked.

“You say that every time.”

She held him at arm’s length and examined him.

“Porque es verdad.”

Uncle Luis leaned against the porch rail with a sweating can of Modelo and his Dodgers cap pulled low, the brim at exactly the angle that meant he was watching without appearing to watch. He gave Julian a short nod.

“That place feeding you right?”

His voice was casual. His eyes stayed on Julian’s face.

“They feed us,” Julian said.

Luis turned the can in his hand. A bead of condensation ran over his knuckle.

Inside, the apartment pushed back against the quiet Julian had spent months getting used to.

His mamá moved at the stove with the practiced efficiency of a musician at a familiar instrument: swirling a wooden spoon through pozole, adjusting a lid, turning slightly to check a timer. Steam fogged the lower half of the windowpane. Rancheras blared from the radio, too loud for the room. Through the wall, the neighbors’ argument rose and fell in a cadence he remembered well enough to know where the pauses would come.

His mamá turned.

For a moment she only looked at him. Then she crossed the kitchen, wiping her hands on a towel, and pulled him close. Her cheek was warm from the stove.

“You’re here,” she said into his shoulder.

As though the car, the flight, the weeks of arrangements had not quite settled the matter until now.

Julian rolled up his sleeves without thinking about it.

The cool, clay-soft give of masa under his palms came back like muscle memory: spread it thin across the husk, fold the edges just so, pinch the seam closed without rushing. His first one was too thick. His mamá looked at it, looked at him, and slid the bowl closer.

He made the next one thinner.

The motion had its own cadence. After a while, the jitter in his veins began to even out. The folding did a version of what the quiet did. It had been doing it years before the quiet existed.

Memories surfaced without invitation.

Eight years old at this same table. His feet not reaching the floor. Counting the seconds between footsteps in the hall, learning the difference between the sound of a key that belonged there and one that did not. Waiting for his parents to come back from night shifts while the kitchen light burned above him.

He had been a careful child.

Catalyst did nothing.

And yet Julian noticed everything.

Luis’s laugh cutting off when a car slowed too long outside. The unfamiliar sedan idling across the street. The window upstairs that was open when it was usually shut tight by now.

His thumb pressed through a husk.

He stared at the small tear, then eased the masa away from it.

At Neurovia there had usually been space between the thing that happened and his response: a breath, a settling, something that let him choose. Here the space collapsed. His shoulders tightened before he had decided whether the sedan mattered.

He reached for another husk.

His father came home at one, work boots leaving their brief impression on the mat, hands scrubbed pink and raw from the site sink. He paused in the doorway, counting heads as he always did.

His gaze settled on Julian at the table.

Relief softened his face and was put away in the same second.

“Mijo.”

“Papá.”

His father pulled out the chair across from him, picked up a husk, and joined in.

No questions. No preamble.

They worked in silence while his mamá moved around them, refilling the masa bowl, adjusting the radio. Her hand rested briefly on Julian’s shoulder as she passed.

The touch was the whole sentence.

After a while his father looked up.

“You sleeping okay?”

“Mostly.”

His father nodded, considering. “Time difference.”

Neurovia was on Eastern time. They both knew that was only part of the question.

“It’s a different kind of different,” Julian said.

His father folded with the slow precision of thirty years of practice.

“How?”

Julian looked at the husk in his hands. A pale strand had peeled away from its edge and stuck to his wrist.

He tried to find the beginning of what he meant.

The first mornings after activation. Everything too sharp and too quiet at once. Then the gradual settling, the way he had stopped noticing the help because the help had become how a day felt.

Now he noticed it in the stopping.

“Everything runs faster,” he said. “My mind. The way I take things in. I notice more than I used to. But I can’t turn off the part that watches for what’s wrong.”

His father’s hands slowed.

“I thought Catalyst would change that. I thought it would just…”

Julian rubbed the strand of husk off his wrist.

“I don’t know what I thought.”

His father set down what he was holding. The radio kept playing. Somewhere behind the wall, a cabinet slammed.

“That part kept you safe,” his father said.

“I know.”

“That’s not something you switch off.”

“I know.” Julian folded the seam closed. “I’m not saying I want to. It’s just at Neurovia, I don’t need it the same way. There’s no reason for it to run all the time. Then I come home and my body hasn’t caught up.”

His mamá had stopped at the stove. She did not turn around. The spoon rested still in her hand.

Julian wished, suddenly, that he had found another way to say it. Something that did not make the kitchen sound like a place he needed protection from.

His father looked down at his hands. There was a split beside one thumbnail, clean now but too deep to have closed.

“That’s why we worked so hard to get you there,” he said. “So you wouldn’t have to carry all of it alone.”

Julian waited.

“But trust takes time to build.” His father looked up. “That’s not a failure, mijo. That’s just time.”

Julian nodded.

He reached for another husk.

His mamá turned the radio up a notch without comment, which in this kitchen meant: I heard you. We’re okay.

That night Julian lay in his childhood bed with its familiar topography of flattened pillows and scratchy blankets. The glow-in-the-dark stars on the ceiling had faded to a pale, tired green. One had lost a point. He remembered lying here years ago, wondering when it would finally fall.

The streetlight pushed through the bent blinds in a wavering stripe across the wall.

He had slept beneath that light for most of his life. It should have been easy.

Sleep came in thin layers. Shallow, dreamless, interrupted by the building settling, footsteps overhead, a car door slamming somewhere down the street. Each time he surfaced he was already alert, already checking.

The room would assemble around him.

The dresser. The door. The stripe of light.

Home.

Sometime before dawn, lying awake with his heart going for no reason he could point to, he arrived at the thing he had been avoiding.

Catalyst had not given him vigilance.

It had given him somewhere to put it down.

***

Mateo’s house announced its intentions before he was through the door.

Lemon polish and fresh espresso. Marble counters catching the overhead light without a flaw. Chrome fixtures without a fingerprint. Climate control holding the air at exactly seventy-two degrees.

The silence here was deliberate, the kind that did not happen on its own.

His older brother Luca was already at the dining table, jacket draped over the chair back just so, phone placed facedown beside his glass. Full attention, visibly offered. Mateo remembered doing the same thing before he left for Neurovia.

Luca looked at him as if a prediction had paid off.

“Neurovia.” His grin had warmth in it and something sharper underneath. “So that’s where they keep the promising ones now.”

“Something like that.”

Mateo took his seat.

Dinner moved with the efficiency of a well-run meeting. Market forecasts came out between courses like documents for review. Regulatory shifts were discussed with the focused interest of people who tracked these things as weather: something to plan around, something that might spoil a good opportunity if you failed to see it coming.

Luca’s recent promotion hovered beneath the conversation. Referenced just often enough that everyone understood it had been noted. Never so often that anyone could accuse him of making it the point.

“Early access to the future is basically what it is,” Luca said, his knife moving through the steak in even, unhurried strokes. “The network alone is worth…”

“It’s disciplined,” Mateo said.

Luca paused.

“That’s an interesting word for it.”

“It’s the right one.”

Their mother watched from across the table, contributing exactly as much as she chose. Their father sat back in his chair, waiting for what was not yet being said.

Later, in the space between two other topics, Mateo mentioned a regulatory gap no one at the table had considered.

He did not introduce it as an argument. He made the observation and reached for his water.

Luca’s fork stopped.

“Good call,” he said. “I hadn’t thought of that.”

Their father leaned forward.

The words should have pleased Mateo. Once, he would have carried them upstairs and turned them over privately, taking care not to seem too pleased while doing it.

Instead, something tightened.

He knew this pressure. He had felt it over the card game: options narrowing around a single outcome until the outcome began to feel inevitable. Luca asked a follow-up question. Their father added one of his own. The conversation moved onto the ground Mateo had given it.

Catalyst offered nothing.

Diagnostic-only.

He answered anyway.

Later, alone in his room, Mateo stood at the floor-to-ceiling window. Streetlights traced the city grid below. Traffic moved in its appointed lanes, red in one direction, white in the other. From this height, even hesitation looked orderly.

At Neurovia, he could hold Catalyst partly responsible for how things shaped themselves around his presence. The nudge he had not asked for. The nudge he had not noticed.

Here, the explanation was harder to reach for.

His family’s conversations had always shifted when he found the right thing to say. He had grown up learning what caught his father’s attention, what made Luca pause, when a question would accomplish more than a claim. He could remember doing it before he had words for what he was doing.

Tonight’s observation had arrived the way the Ghost’s answers had arrived: unbuilt, already fitted to the room.

He had spoken before he had fully examined it.

With Catalyst in diagnostic mode, there had been no one to ask but himself.

Mateo rested two fingers against the glass. The window was cool despite the carefully maintained warmth behind him.

The fast answer had always lived in him. The game had only taught him its name.

Knowing that did not tell him how to stop. It did not even tell him which moments should be stopped. The regulatory gap was real. Luca had been interested. No one had lost anything because Mateo had noticed it.

He went through those facts again.

They remained true. They did not make him feel better.

He wondered when his family would notice that the pattern had grown stronger.

Then he pictured his father leaning forward, Luca setting down his fork.

Perhaps they had noticed.

Perhaps a son who could quietly steer a room of adults was a useful son, and usefulness was sufficient. Perhaps what unsettled him would look, from the other side of the table, like progress.

Behind him, his room waited exactly as he had left it.

He stayed at the window.

***

Aisha’s house reached her before the door did.

Cardamom and cumin cut through the cooler air, tangled with the sound of something frying. Three separate conversations competed at volumes that assumed the other conversations were not there. Shoes crowded the entryway in a cheerful jumble: slippers, sneakers, sandals belonging to people of at least four different sizes.

Sami hit her at speed before she had fully cleared the threshold.

“Aisha!”

She caught herself against the doorframe and grabbed him back, laughing, her bag sliding off her shoulder.

“You’ve gotten heavier.”

“You’ve been gone.”

Apparently that settled it.

Behind him, Layla hung back in the hallway, older, quieter. She was reading Aisha’s face as she had always read it, checking for something before deciding how to come forward.

Aisha met her eyes and gave the small nod that meant: I’m good. Come here.

Layla came.

Dinner was everything Neurovia was not.

Too many dishes. Not enough table space. Arguments about seating that became arguments about something else and then became laughter. Someone reached across Aisha for a serving spoon while someone else asked her a question she could not hear. Steam rose between the faces. A glass tipped, was caught, and earned more celebration than the save deserved.

The room arrived unscored.

No weights, no rankings, no salience delivered to the shelf of her mind.

She read it anyway, by hand, the old craft, and found the craft intact. It had never belonged to the implant. Lately, the implant had only made it faster.

Halfway through the second course, she heard the change in Sami’s voice.

He had been trying to describe his school project while an older cousin nodded along, eyes drifting toward his phone. Sami’s explanation grew louder. His fingers tightened on his fork.

Another interruption and he would shout. Then everyone would tell him not to shout, and whatever he had wanted to say would disappear beneath the correction.

Aisha leaned toward him.

“Sami. Tell me. I want the full version.”

She put her elbow on the table, rested her chin on her hand, and gave him her actual face.

The room continued around them.

Sami looked at her as though the real audience had just arrived. He started over, slower this time. His grip on the fork loosened. The words assembled properly now that he had somewhere to put them.

Across the table, her mother caught the moment without commenting.

Aisha returned her attention to Sami.

He talked for four minutes. She listened to every word. When he finished, she asked about a part he had skipped over, and he brightened with such unguarded pleasure that she felt a brief ache beneath her ribs.

Then she noticed what she had done.

The turn toward him. The posture. The exact amount of interest in her voice before interest had become effortless.

She had wanted to hear him. That was true.

She had also known what giving him her attention would do.

Aisha picked up her glass. Water had collected beneath it, leaving a dark ring on the tablecloth.

Before Neurovia, the gesture would have passed almost unnoticed, one small adjustment among dozens. Keep Sami from shouting. Give Layla a way into the conversation. Ask the question that let someone recover from a joke that had gone wrong.

She would have gone to bed tired without knowing quite what had tired her.

Now she could feel the adjustments happening.

She was not sure seeing them was an improvement.

During the pause before the next course, her mother caught her eye again.

There was gratitude in the look. Aisha recognized that much.

Something else, too.

Her mother had been watching her all evening with an attention Aisha could not remember receiving in quite this form. Perhaps she was waiting to ask about Neurovia. Perhaps she had noticed the pauses—the small delays while Aisha examined things she used to do without thinking.

Aisha reached for a dish and asked whether anyone wanted more.

Her mother let the moment pass.

Aisha was relieved, then disappointed in the relief.

She did not yet know what she would say if the question came.

Later, in her childhood bed, Aisha listened to the house come down from its evening.

Doors opened and closed. Hushed voices drifted along the hall, her parents talking low as they used to when the children were supposed to be asleep. Her father’s feet shuffled over the tile during his final check of the rooms.

She had mapped this house in sound long before she had mapped it in anything else.

His steps stopped outside her door.

Aisha kept her eyes closed.

After a moment, they moved on.

She thought about Sami’s face when she had given him her attention. Two years ago, she would have reached toward him without noticing the reach. Tonight, she had watched herself decide.

The gesture had looked the same.

Sami had been happy.

She could still remember the part of his project he was most excited about. She had another question to ask him in the morning.

None of that felt false.

But she could not settle the other part: whether examining the choice made it more hers, or whether there was something she could lose by watching herself too closely.

Down the hall, her parents’ conversation stopped. A tap ran. The pipes clicked inside the wall.

Aisha turned onto her side and listened until the house grew quiet.

***

Soren’s house was immaculate.

Neither warm nor cold. A precise neutrality, every surface and line in its designated position, nothing left to chance or ornament.

He noted the empty chair at the far end of the dinner table.

The absence it held was architectural: a calibrated space, a removed variable. No one mentioned it. No one had mentioned it in years.

The chair stayed as a kind of instruction.

“You’re performing well,” his father said, eyes on his plate, cutting his food into identical pieces.

“Yes.”

A pause. Silverware against porcelain.

“Control matters more than victory. You understand why.”

“Yes.”

“You know what happens otherwise.”

Soren looked at the chair.

“Yes,” he said.

His father nodded and returned to his plate.

Then he set down his fork.

“Anything I should know about the program?”

Soren looked at him.

His father did not usually ask about the program. He received reports through channels Soren had never been told about, processed them privately, and made clear what he expected to see in the next round of metrics.

The arrangement had held since Soren arrived at Neurovia.

Tonight, he was asking.

Something in the reports might have changed. Or something might have been left out. Soren could not tell which, and his father’s expression offered him nothing useful.

He took a moment before answering.

“We lost an exercise last week,” he said. “We won another in a way that won’t look clean in the analysis.”

“Explain the unclean win.”

Soren kept it short.

The arena. Their loss of the early advantage. The escalation. A student injured badly enough to require evacuation. Cohort Two abandoning the objective to follow her out.

He left out Rafe’s name. He did not describe the sound of the collision.

His father listened without interrupting.

“Will it happen again?”

Soren’s hand rested beside his glass.

“If we’re losing in the same configuration, possibly.”

“Fix the configuration.”

“Yes.”

His father picked up his fork.

Soren ate the rest of his meal in silence. Once, without meaning to, he looked toward the empty chair again.

Later, alone in his room, Soren sat on the edge of his bed and looked at the shelf where his older brother’s trophies used to stand.

They had been removed years ago. The shelf had stayed.

No books had been moved into the space. No photograph. Nothing that might have allowed the absence to become ordinary.

He had spent years shaping his life around not becoming the person whose trophies had been removed.

Three months at Neurovia had not loosened that habit. Sitting here, with the bedspread pulled smooth beneath his hands, he could feel it tightening into its old shape.

He turned his attention to the rematch.

The final outcome was settled. What remained unsettled was the stretch before the win, when a plan he trusted had begun producing results it should not have produced.

There had been a moment when his certainty shifted all at once.

He remembered the whiteboard. The changes. Small enough to pass as refinements, fitted closely enough to the existing plan that he had considered whether he had made them himself.

He had noticed.

He had not asked.

In the arena, the altered plan had felt like his own judgment until the cost became visible. He disliked remembering how little resistance he had offered it.

Catalyst had not done that.

Soren sat still.

He had been about to close the question.

He did not know enough to close it. After the arena, he had asked the medical staff what Catalyst’s authorization scope included. Their answers had been careful and narrow. By the end of the conversation, he had known more about the approved wording than the actual limits.

He had saved his curiosity for later.

Now it was later.

Someone had changed the plan. That much he had seen. Whoever had done it understood enough of its structure to make the changes look as though they belonged.

Beyond that, he had possibilities.

A person. Assistance. Something he had not considered yet.

He got up and went to the window.

Headlights traced their orderly arcs along the road below. A car slowed at the bend, disappeared behind the trees, then emerged farther down. Soren watched the next one take the same turn.

The altered plan could be studied. So could his acceptance of it.

He would need to separate what had been done to their preparation from what they had chosen afterward. Rafe’s collision did not become someone else’s decision because the formation had failed.

Neither did Soren’s silence.

Behind him, the empty shelf remained in his peripheral vision.

When he returned to Neurovia, he would carry both things with him: the old instruction waiting in that space, and the unanswered question of what had entered their cohort’s work.

He was not yet sure what he would do if answering one put him at odds with the other.

***

Julian sat at the gate with his bag between his feet.

Around him, the terminal moved at the compressed, irritable pace of a holiday weekend ending. Suitcase wheels rattled over joints in the floor. A child cried against someone’s shoulder. At the next gate, an announcement dissolved beneath the first words of another.

Catalyst was still in diagnostic mode.

For once, he did not miss the annotations.

His abuela had walked him to the security line with a tin of tortillas wrapped in foil. She had said little. Pressed the tin into his hands, patted his cheek, and turned toward the exit without waiting for him to leave.

He had watched until the crowd took her.

Now the tin sat inside his bag, its round edge pressing against his ankle.

He had not decided what to do with what he had learned. He was not sure deciding was the right verb. The recognition had landed somewhere he could not yet act from, only carry.

His group was called.

Julian lifted his bag and joined the line.

After takeoff, he watched the grid of Los Angeles compress beneath the wing. For a while he tried to find his neighborhood among the lights. Then the plane banked, and the familiar shapes turned away.

Cloud covered the city.

There was only the dark window, his faint reflection, and the long black nothing of the continent passing underneath.